package com.my.chapter21;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class practice23 {
    public static void main(String[] args) throws InterruptedException {
        Car car = new Car();
        ExecutorService exec = Executors.newCachedThreadPool();
        exec.execute(new WaxOff(car));
        exec.execute(new WaxOn(car));
        TimeUnit.SECONDS.sleep(5); // Run for a while...
        exec.shutdownNow(); // Interrupt all tasks
    }
}

class Car {
    private boolean waxOn;
    public synchronized void waxed() {
        waxOn = true; // Ready to buff
        notify();
    }
    public synchronized void buffed() {
        waxOn = false; // Ready for another coat of wax
        notify();
    }
    public synchronized void waitForWaxing()
            throws InterruptedException {
        while(waxOn == false)
            wait();
    }
    public synchronized void waitForBuffing()
            throws InterruptedException {
        while(waxOn == true)
            wait();
    }
}


class WaxOn implements Runnable {
    private Car car;
    public WaxOn(Car c) { car = c; }
    public void run() {
        try {
            while(!Thread.interrupted()) {
                System.out.print("Wax On! ");
                TimeUnit.MILLISECONDS.sleep(200);
                car.waxed();
                car.waitForBuffing();
            }
        } catch(InterruptedException e) {
            System.out.println("Exiting via interrupt");
        }
        System.out.println("Ending Wax On task");
    }
}

class WaxOff implements Runnable {
    private Car car;
    public WaxOff(Car c) { car = c; }
    public void run() {
        try {
            while(!Thread.interrupted()) {
                car.waitForWaxing();
                System.out.print("Wax Off! ");
                TimeUnit.MILLISECONDS.sleep(200);
                car.buffed();
            }
        } catch(InterruptedException e) {
            System.out.println("Exiting via interrupt");
        }
        System.out.println("Ending Wax Off task");
    }
}